Hi,
i didn't recommend the ESE. I just wanted to point out that there are some restrictions on the Express-C Editions which you don't have on ESE. So you check your Database if you can switch to Express-C.
But you brought up another point. You want to run the Database on a Microsoft Cluster, so the Database or Application requires high availability. And now you want to run your Database without support from IBM? Maybe you want to reconsider.
Cheers
nvk